How big is it? I would try to configure the pen smaller, or leave her in the crate instead. If sheís okay in the crate for 2 hours, and youíve left her that long s few times, I think you can push it to 3.
If you decide to indoor train, now is the time, but she doesnít need a space bigger than enough room to lay down and her potty tray. Iíd consider placing the pad from her crate in the expen if you can, because she already does not want to pee on what youíre using in the crate. Donít feel like you need to give her room to play when you use the expen. Sheís not ready for it. The small space will help her feel secure while youíre gone, whether itís in the crate or the expen.
In general, if sheís still adjusting to being left alone, isnít home alone often, or if she hears noise outside, she might not be able to hold it as long as she usually can. If she isnít alone often, Iíd try to schedule some time to get everyone out of the house, even if itís just to go for a walk without her, to give her more practice. The accidents might be less of a problem if you decide to go with indoor potty, but it might be contributing and itís good for her either way.
If you do want her to use the indoor potty, I donít think sheíll figure it out if itís just there while youíre gone. Unless I misunderstood? I think indoor training is really useful, and I really suggest it if you can. It is easy to start taking her outside down the line, and it makes the first six months of potty training much easier. But in order for her to learn to use it, I think she needs consistent access to it. A lot of people take their dogs outside but have a potty tray for backup when theyíre not home. But in that case, itís an older puppy or dog has already learned how to use it.
This is the hardest part! Potty training is a long road, but it wonít be like this the whole time. Once you have these things set up, itíll be a much easier road to travel